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Inorganic crystal whisker modified synergic polyimide/epoxy blend and preparation method thereof

A polyimide siloxane, synergistic modification technology, applied in the field of polyimide/epoxy blends, can solve the problems of limited application, brittleness, poor impact resistance and stress crack resistance, and achieve Effect of improving strength and thermal stability

Inactive Publication Date: 2010-06-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest weakness of the cross-network structure of thermosetting resins is that they are brittle after curing, and have poor impact and stress crack resistance, which limits their application in certain fields.

Method used

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  • Inorganic crystal whisker modified synergic polyimide/epoxy blend and preparation method thereof
  • Inorganic crystal whisker modified synergic polyimide/epoxy blend and preparation method thereof
  • Inorganic crystal whisker modified synergic polyimide/epoxy blend and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Formula: (parts by weight)

[0032] 100 parts epoxy resin

[0033] Methyltetrahydrophthalic anhydride 80 parts

[0034] N,N-Dimethylbenzylamine 0.1 parts

[0035] 3 parts calcium sulfate whiskers

[0036] Epoxy resin preferably adopts the epoxy resin that average epoxy equivalent is 171g / eq;

[0037] The average length of the calcium sulfate whiskers is 100 (μm), and the average diameter is 5 (μm);

[0038] Preparation:

[0039] Mix the epoxy resin and calcium sulfate whiskers, stir mechanically at a speed of 500 rpm for 5 minutes, and disperse;

[0040] Then at 130°C, add curing agents methyltetrahydrophthalic anhydride and N,N-dimethylbenzylamine, stir mechanically for 3 minutes, pour into the mold, put it into a 150°C oven for curing for 6 hours, and then post-cure at 180°C for 3 minutes. Hours, demoulding to obtain inorganic calcium sulfate whisker modified epoxy resin.

[0041] Electron microscope photos such as figure 1 . Thermogravimetric analysis curve ...

Embodiment 2

[0043] formula:

[0044] 100 parts epoxy resin

[0045] Polyimide siloxane 30 parts

[0046] Methyltetrahydrophthalic anhydride 80 parts

[0047] N,N-Dimethylbenzylamine 0.3 parts

[0048] Calcium Sulfate Whiskers 5 parts

[0049] Epoxy resin preferably adopts the epoxy resin that average epoxy equivalent is 171g / eq;

[0050] The average length of the calcium sulfate whiskers is 80 (μm), and the average diameter is 5 (μm);

[0051] Preparation:

[0052] Add epoxy resin to 30g polyimide siloxane and heat to dissolve at 180°C;

[0053] Add calcium sulfate whiskers, stir mechanically at a speed of 500 rpm for 10 minutes, and disperse;

[0054] At 130°C, add curing agents methyltetrahydrophthalic anhydride and N,N-dimethylbenzylamine, stir mechanically for 2 minutes, pour into the mold, put in an oven at 150°C for 5 hours, and then post-cure at 200°C for 2 hours. Release the mold to obtain a polyimide / epoxy blend modified by inorganic calcium sulfate whiskers.

[0055] mi...

Embodiment 3

[0057] Recipe: (weight)

[0058] 100 parts epoxy resin

[0059] Polyimide siloxane 25 parts

[0060] Methyltetrahydrophthalic anhydride 85 parts

[0061] N,N-Dimethylbenzylamine 0.3 parts

[0062] 3 parts calcium sulfate whiskers

[0063] Epoxy resin preferably adopts the epoxy resin that average epoxy equivalent is 171g / eq;

[0064] The average length of the calcium sulfate whiskers is 50 (μm), and the average diameter is 15 (μm);

[0065] Preparation:

[0066] Add epoxy resin to polyimide siloxane, heat and dissolve at 180°C; add calcium sulfate whiskers, mechanically stir at 500 rpm for 10 minutes, and disperse;

[0067] At 130°C, add curing agents methyltetrahydrophthalic anhydride and N,N-dimethylbenzylamine, stir mechanically for 2 minutes, pour into the mold, put in a 150°C oven for curing for 6 hours, and then post-cure for 3 hours at 190°C. An inorganic calcium sulfate whisker-modified polyimide / epoxy blend was obtained.

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Abstract

The invention discloses an inorganic crystal whisker modified synergic polyimide / epoxy blend and a preparation method thereof. The blend comprises the following components in parts by weight: 100 parts of epoxy resin, 0-30 parts of polyimide siloxane, 75-85 parts of curing agent, 0-0.3 part of accelerator and 2-10 parts of calcium sulfate crystal whisker. The invention takes calcium sulfate crystal whisker as a further modified additive, and polyimide modified epoxy resin is added; as the crystal whisker is fiber growing in the form of single crystal under the condition of manual control, the crystal whisker has small diameter, and reinforced composite material has the potential of reaching high performance.

Description

technical field [0001] The invention relates to a polyimide / epoxy blend synergistically modified by inorganic whiskers. Background technique [0002] Thermosetting resin is a kind of cross-linked polymer material with network structure, generally has good mechanical properties, electrical properties and bonding properties. They are widely used in the technical fields of machinery, electronics, aerospace and other fields in the form of adhesives, coatings, potting materials and composite materials. Among them, epoxy resin, phenolic resin, unsaturated resin and bismaleimide resin are representative. However, the biggest weakness of the cross-network structure of thermosetting resins is that they are brittle after curing, and have poor impact and stress crack resistance, which limits their application in certain fields. Therefore, the toughening modification of thermosetting resins has always been a research topic of great concern to experts in polymer materials. [0003] Wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L79/08C08K13/04C08K7/08C08K5/09C08K5/17
Inventor 甘文君陈圆张晓艳潘冰洁
Owner SHANGHAI UNIV OF ENG SCI
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